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Use the script below to create an updateable view named balance_due_view. Then, create and test an INSTEAD OF trigger named invoices_instead_of_insert that lets the user update the columns in the view by directly updating the Invoices table. Within this trigger, you can call the stored procedure named insert_invoice that's created by the script for figure 15-5
CREATE OR REPLACE VIEW balance_due_view AS
SELECT vendor_name, invoice_number,
invoice_total, payment_total, credit_total,
invoice_total - payment_total - credit_total AS balance_due
FROM vendors JOIN invoices ON vendors.vendor_id = invoices.vendor_id
WHERE invoice_total - payment_total - credit_total > 0;
A column that uses the CAST function to return the DateAdded column with its full time only (hour, minutes, seconds, and milliseconds)
Display the CustomerID from the Orders table and the sum of the associated ItemPrice multiplied by Quantity using Gross Sales (with a space) as the column name from the OrderItems table.
Write down actors (or actress, your choice, but not both) who have won at least two (2) Academy Awards for best actor/actress. Provide the actor name, movie title & year. Order the result by actor name."
Create a database model and Submit the table creation statements for the Database Model.
Explain how you will go about developing this database. Provide at least four queries that answer some of the questions asked by the end users.
Write a script that creates and calls a function named fnItemTotal that calculates the total amount of an item in the OrderItems table (discount price multiplied by quantity)
To represent a problem description given in natural language as an (Enhanced) Entity -Relationship model; to convert the ER/EER model into a relational data model;
Write a PL/SQL block that displays the last name and salary of the following people. Each of these can be done separately as PL/SQL, first to test and get the output lines then encapsulated in the procedure.
Write summary query which uses CUBE operator to return LineItemSum (which is the sum of InvoiceLineItemAmount) group by Account(an alias for AccountDesciption).
Write SQL commands which would implement this profile. Next, write query that would list profile, profile resource name, and limit value for the new profile.
Prepare the SQL query for each of given requirements. Convert requirement to logic, then to SQL. Illustrate the names of all products which have been sold.
Display all the LastNames from the Customers table and any associated OrdersIDs from the Orders Table. Show the LastName even if they do not have any associated orders. Order the results by LastName in ascending order.
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